Connection structure of load leading-out terminal and ceramic cover and relay

Abstract

The utility model provides a connection structure of a load leading-out terminal and a ceramic cover and a contactor, the ceramic cover is provided with a mounting hole, and the load leading-out terminal is arranged in the mounting hole in a penetrating manner and is spaced from the ceramic cover; the load leading-out end is provided with a first part located outside the ceramic cover and a second part extending into the ceramic cover, and the first part of the load leading-out end is provided with a welding face and used for being electrically connected with an external component and being connected with an external circuit through laser welding; the periphery of the first part of the load leading-out terminal is provided with a heat insulation member and is fixedly connected with the ceramic cover through the heat insulation member. Through the arrangement of the heat insulation piece, high-temperature heat generated by welding can be effectively isolated, the ceramic cover is prevented from cracking due to the high temperature of welding, and the product quality is improved. The utility model also provides a relay.

Description

Technical Field

[0001] The utility model relates to the field of relays, in particular to a connection structure between a load lead-out terminal and a ceramic cover and a relay. Background Art

[0002] A relay is an automated control device that uses a coil to generate a magnetic field to close the contacts to control the load. The contact part of the relay is isolated in a ceramic cover and is led out by the load lead-out terminal that penetrates the ceramic cover.

[0003] At present, the load lead terminals of some relays are connected to external components by welding (such as laser welding). The temperature generated when the load lead terminals are welded to external components is extremely high. When laser welding is used, the instantaneous temperature generated is extremely high, which can easily cause the ceramic cover to crack, and then cause abnormal product damage. Utility Model Content

[0004] Therefore, in order to improve the above problems, the utility model provides a connection structure between a load lead-out terminal and a ceramic cover and a relay.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] A connection structure between a load lead-out terminal and a ceramic cover, wherein the ceramic cover has a mounting hole, the load lead-out terminal is inserted into the mounting hole and is spaced apart from the ceramic cover; the load lead-out terminal has a first portion located outside the ceramic cover and a second portion extending into the interior of the ceramic cover, the first portion of the load lead-out terminal has a welding surface for electrically connecting to an external component; a heat insulating member is also provided on the periphery of the first portion of the load lead-out terminal, and the load lead-out terminal is fixedly connected to the ceramic cover via the heat insulating member.

[0007] Furthermore, the first end of the thermal insulation ring is fixedly connected to the ceramic cover, and the second end of the thermal insulation ring is fixedly connected to the first part of the load lead-out terminal.

[0008] Furthermore, the thermal insulation member is an annular thermal insulation ring, and the thermal insulation ring is sleeved on the periphery of the first part of the load lead-out end.

[0009] Furthermore, the ring wall of the thermal insulation ring is a non-straight arm section.

[0010] Furthermore, the diameter of the heat-insulating ring is gradually reduced near the second end, so that the ring wall near the second end is an arc-shaped arm segment.

[0011] Furthermore, the load lead-out end includes a rod segment and a welding portion, the two ends of the rod segment are respectively a first end and a second end, the welding portion is connected to the first end of the rod segment and radially protrudes from the rod segment; the welding surface is formed on the side of the welding portion facing away from the ceramic cover, the rod segment is inserted into the mounting hole and is arranged at a distance from the ceramic cover, the rod segment also has a first segment close to the first end and located outside the ceramic cover and a second segment close to the second end and located inside the ceramic cover, the first end and the first segment of the rod segment, and the welding portion are located outside the ceramic cover to form the first part, and the second end and the second segment of the rod segment are located inside the ceramic cover to form the second part.

[0012] Furthermore, the second end of the heat insulation ring is fixedly connected to the surface of the welding portion facing the ceramic cover.

[0013] Furthermore, the diameter of the welding part is the same as the maximum diameter of the insulation ring; the second end of the insulation ring is bent inward so that the end face of the second end is set inward, and the outer peripheral surface of the insulation ring is against the surface of the welding part facing the ceramic cover to form a fixed connection.

[0014] Furthermore, the thermal conductivity of the thermal insulation component is smaller than that of the load lead-out terminal.

[0015] Furthermore, the thermal insulation component is made of Kovar alloy.

[0016] Furthermore, the first end of the thermal insulation ring and the ceramic cover, and the second end of the thermal insulation ring and the first part of the load lead-out terminal are fixedly connected by brazing.

[0017] Furthermore, the welding surface of the first part of the load lead-out terminal is connected to an external component by laser welding. Specifically, the external component is a copper busbar.

[0018] A relay at least comprises the above-mentioned connection structure between the load lead-out terminal and the ceramic cover.

[0019] The technical solution provided by the utility model has the following beneficial effects:

[0020] 1. The load lead-out terminal is passed through the mounting hole of the ceramic cover and is spaced apart from the ceramic cover. A heat insulating member is added between the first part of the load lead-out terminal and the ceramic cover for heat insulation, thereby avoiding direct contact between the load lead-out terminal and the ceramic cover. The high temperature heat generated by laser welding can be effectively isolated, and the ceramic cover can be effectively prevented from cracking due to the high temperature of laser welding, thereby improving the quality of the product.

[0021] 2. The thermal insulation component is an annular thermal insulation ring. Furthermore, the thermal insulation ring is a Kovar ring made of Kovar alloy. The Kovar ring has the advantages of low thermal expansion coefficient, good mechanical properties, corrosion resistance and easy processing. While playing the role of thermal insulation, the material stress itself is small, the deformation after heating is small, and it will not put excessive pressure on the ceramic cover.

[0022] 3. The ring wall of the heat-insulating ring is a non-straight arm section, which increases the flexibility of the ferrous ring and further reduces the stress on the ceramic cover caused by the deformation of the ferrous ring during laser welding, thereby providing better protection.

[0023] 4. The diameter of the welding part is the same as the maximum diameter of the thermal insulation ring, and can be positioned together by tooling; and the second end of the thermal insulation ring is bent inward so that the end face of the second end is set inward, and the outer peripheral surface of the thermal insulation ring is against the surface of the welding part facing the ceramic cover to form a fixed connection, thereby ensuring a fixed connection with the welding part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a three-dimensional schematic diagram of the connection structure between the load lead-out terminal and the ceramic cover in the embodiment;

[0025] Figure 2 The figure shows a side view of the connection structure between the load lead-out terminal and the ceramic cover in the embodiment;

[0026] Figure 3 The figure shows a cross-sectional view of the connection structure between the load lead-out terminal and the ceramic cover in the embodiment;

[0027] Figure 4 Shown Figure 3 A magnified schematic diagram of the middle A area;

[0028] Figure 5 The figure is a three-dimensional schematic diagram of the heat insulation ring in the embodiment;

[0029] Figure 6 Shown is a side view of the thermal insulation ring in the embodiment;

[0030] Figure 7 Shown is a cross-sectional view of a thermal insulation ring in an embodiment. DETAILED DESCRIPTION

[0031] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0033] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0034] Reference Figures 1 to 7 As shown, the present embodiment provides a connection structure between a load lead-out terminal and a ceramic cover, the number of load lead-out terminals 20 is two, distributed on the left and right, the ceramic cover 10 is provided with two mounting holes 11, and the two load lead-out terminals 20 are respectively inserted into the two mounting holes 11 and arranged at a distance from the ceramic cover 10. The load lead-out terminal 20 has a first part 201 located outside the ceramic cover 10 and a second part 202 extending into the ceramic cover 10. Specifically, the load lead-out terminal 20 also has a third part located in the mounting hole 11, the third part is connected between the first part 201 and the second part 202, and the third part is arranged at a distance from the inner wall of the mounting hole 11. Among them, the first part 201 of the load lead-out terminal 20 has a welding surface 1. During the subsequent assembly, the welding surface 1 of the first part 201 of the load lead-out terminal 20 needs to be electrically connected to an external component (such as a copper bus) by laser welding (of course, other welding methods can also be used). A heat insulating member is also provided on the periphery of the first part 201 of the load lead-out terminal 20. Specifically, in the present embodiment, the heat insulating member is a heat insulating ring 30, which is sleeved on the periphery of the first part 201 of the load lead-out terminal 20. The load lead-out terminal 20 is fixedly connected to the ceramic cover 10 via the heat insulating ring 30, thereby avoiding direct contact between the load lead-out terminal 20 and the ceramic cover 10.

[0035] The load lead-out terminal 20 avoids direct contact with the ceramic cover 10, effectively preventing the heat of the load lead-out terminal 20 from being directly conducted to the ceramic cover 10 during welding. That is, when the first part 201 of the load lead-out terminal 20 is connected to an external component by laser welding, the setting of the heat insulation ring 30 plays a heat insulation role, which can effectively isolate the instantaneous high temperature heat generated by laser welding, and prevent the ceramic cover 10 from being cracked by the instantaneous high temperature of laser welding, so as to improve the quality of the product.

[0036] Further, the first end 301 of the insulation ring 30 is fixedly connected to the ceramic cover 10, and the second end 302 of the insulation ring 30 is fixedly connected to the first part 201 of the load lead-out terminal 20. In this embodiment, the first end 301 of the insulation ring 30 and the ceramic cover 10, and the second end 302 of the insulation ring 30 and the first part 201 of the load lead-out terminal 20 are fixedly connected by brazing. That is, the load lead-out terminal 20 and the ceramic cover 10 are fixedly assembled by the insulation ring 30.

[0037] The thermal conductivity of the insulation ring 30 is smaller than that of the load lead-out terminal 20. Preferably, the insulation ring 30 is a Kovar ring 3 made of Kovar alloy. The Kovar ring 3 has the advantages of low thermal expansion coefficient, good mechanical properties, corrosion resistance and easy processing. While playing the role of heat insulation, the material stress itself is small, the deformation after heating is small, and the ceramic cover 10 will not be over-pressed.

[0038] At the same time, the ring wall of the kovar ring 3 is a non-straight arm segment, specifically, the diameter of the kovar ring 3 near the second end 302 is gradually reduced, so that the ring wall near the second end 302 is an arc-shaped arm segment. Such a configuration increases the flexibility of the kovar ring 3, further reduces the stress on the ceramic cover 10 caused by the deformation of the kovar ring 3 during laser welding, and provides better protection.

[0039] Specifically, in this embodiment, the load lead-out terminal 20 includes a rod segment 21 and a welding portion 22 connected to a first end of the rod segment 21 and radially protruding from the rod segment 21. Figure 3 As shown, the two ends of the rod segment 21 are respectively the first end and the second end. Specifically, the first end of the rod segment 21 is the upper end, and the second end is the lower end. The welding surface 1 is formed on the side of the welding portion 22 facing away from the ceramic cover 10, that is, the upper surface of the welding portion 22 is the welding surface 1. The rod segment 21 is inserted into the mounting hole 11 and is arranged at a distance from the ceramic cover 10. The rod segment 11 also has a first section close to the first end and located outside the ceramic cover 10 (that is, the part inserted into the Kovar ring 3) and a second section close to the second end and located inside the ceramic cover 10. The first end and the first section of the rod segment 21 and the welding portion 22 are located outside the ceramic cover 10 to form the first part 201, and the second end and the second section of the rod segment 22 are located inside the ceramic cover 10 to form the second part 202; the third part of the load lead-out terminal 20 is located between the first section and the second section.

[0040] The second end portion 302 of the kovar ring 3 is fixedly connected to the surface of the welding portion 22 facing the ceramic cover (such as Figure 3 , Figure 4 It is shown on the lower surface 221 of the welding portion 22, that is, it is not exposed on the outside of the welding portion, simplifying the structure.

[0041] The diameter of the welding portion 22 is the same as the maximum diameter of the kovable ring 3, so that they can be positioned together by tooling; further, the second end portion 302 of the kovable ring 3 is bent inward so that the end face 31 of the second end portion 302 is set inward, and the outer peripheral surface of the kovable ring 3 is against the surface of the welding portion 22 facing the ceramic cover 10 (i.e., the lower surface 221) to form a fixed connection, thereby avoiding the second end portion 302 of the kovable ring 3 from being close to the outer edge of the welding portion 22 and resulting in insufficient welding surface, thereby ensuring a fixed connection with the welding portion 22.

[0042] In this embodiment, the heat insulating member adopts an annular heat insulating ring 30 (further a Kovar ring 3), which is one of the preferred embodiments in this application. Of course, in other embodiments, the heat insulating member may not adopt an annular heat insulating ring 30, but may adopt a member with a "C" shaped cross section, or a member of other shapes, as long as it has a heat insulating effect.

[0043] This embodiment also provides a relay, which at least includes the connection structure between the load lead-out terminal and the ceramic cover described above. The contact part of the relay is arranged in the ceramic cover 10, and the load lead-out terminal 20 is the static end lead-out terminal of the contact part.

[0044] The scheme disclosed in the above embodiment is one of the more preferred implementation schemes. Of course, it is not limited to this in other embodiments. For example, the fixed connection structure between the load lead-out terminal 20 and the ceramic cover 10, the fixed connection structure between the insulation ring 30 and the ceramic cover 10, and the fixed connection structure between the insulation ring 30 and the load lead-out terminal 20 can also be fixed by other methods such as gluing; the insulation ring 30 can also be made of other materials with the same thermal insulation performance; the ring wall of the insulation ring 30 can also be a straight arm section structure, etc.

[0045] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A connection structure between a load lead terminal and a ceramic cover, characterized in that: The ceramic cover has a mounting hole, and the load lead-out terminal is inserted into the mounting hole and is spaced apart from the ceramic cover; the load lead-out terminal has a first part located outside the ceramic cover and a second part extending into the interior of the ceramic cover, and the first part of the load lead-out terminal has a welding surface for achieving electrical connection with external components; a heat insulating member is also provided on the periphery of the first part of the load lead-out terminal, and the load lead-out terminal is fixedly connected to the ceramic cover through the heat insulating member.

2. The connection structure between the load lead terminal and the ceramic cover according to claim 1, characterized in that: The first end of the thermal insulation member is fixedly connected to the ceramic cover, and the second end of the thermal insulation member is fixedly connected to the first part of the load lead-out terminal.

3. The connection structure between the load lead terminal and the ceramic cover according to claim 2, characterized in that: The heat insulating member is an annular heat insulating ring, and the heat insulating ring is sleeved on the periphery of the first part of the load lead-out end.

4. The connection structure between the load lead terminal and the ceramic cover according to claim 3, characterized in that: The ring wall of the heat insulation ring is a non-straight arm section.

5. The connection structure between the load lead terminal and the ceramic cover according to claim 4, characterized in that: The diameter of the heat-insulating ring is gradually reduced near the second end, so that the ring wall near the second end is an arc-shaped arm segment.

6. The connection structure between the load lead terminal and the ceramic cover according to claim 3, 4 or 5, characterized in that: The load lead-out end includes a rod segment and a welding portion, the two ends of the rod segment are respectively a first end and a second end, the welding portion is connected to the first end of the rod segment and radially protrudes from the rod segment; the welding surface is formed on the side of the welding portion facing away from the ceramic cover, the rod segment is inserted into the mounting hole and is spaced apart from the ceramic cover, the rod segment also has a first segment close to the first end and located outside the ceramic cover and a second segment close to the second end and located inside the ceramic cover, the first end of the rod segment, the first segment, and the welding portion are located outside the ceramic cover to form the first part, and the second end of the rod segment and the second segment are located inside the ceramic cover to form the second part.

7. The connection structure between the load lead terminal and the ceramic cover according to claim 6, characterized in that: The second end of the heat insulation ring is fixedly connected to the surface of the welding portion facing the ceramic cover.

8. The connection structure between the load lead terminal and the ceramic cover according to claim 7, characterized in that: The diameter of the welding part is the same as the maximum diameter of the insulation ring; the second end of the insulation ring is bent inward so that the end face of the second end is set inward, and the outer peripheral surface of the insulation ring is against the surface of the welding part facing the ceramic cover to form a fixed connection.

9. The connection structure between the load lead terminal and the ceramic cover according to claim 3, 4 or 5, characterized in that: The first end of the heat-insulating ring and the ceramic cover, as well as the second end of the heat-insulating ring and the first part of the load lead-out end, are fixedly connected by brazing.

10. The connection structure between the load lead terminal and the ceramic cover according to claim 1, characterized in that: The thermal conductivity of the thermal insulation member is smaller than that of the load lead-out terminal.

11. The connection structure between the load lead terminal and the ceramic cover according to claim 10, characterized in that: The thermal insulation member is made of Kovar alloy.

12. The connection structure between the load lead terminal and the ceramic cover according to claim 1, characterized in that: The welding surface of the first portion of the load lead-out terminal is connected to the external component by laser welding.

13. The connection structure between the load lead terminal and the ceramic cover according to claim 1 or 12, characterized in that: The external component is a copper busbar.

14. A relay, characterized in that: At least includes the connection structure between the load lead-out terminal and the ceramic cover as described in any one of claims 1 to 13 above.

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